21 (火)	01:51	07:43	14:08	20:18
	71cm	33cm	83cm	37cm
大潮 出 04:28 入 18:13 出 04:05 入 16:13

コイセボイ（北海道）2020年04月21日の10分毎の潮の高低差を確認できます。
また1日の潮の高低差が1番大きい（潮の流れが大きい）時間に「最大潮位差」と明記してます。

時刻	潮位	高低差	各ポイント
4/21 00:00	61.9	↑1.4
4/21 00:10	63.2	↑1.3
4/21 00:20	64.5	↑1.3
4/21 00:30	65.6	↑1.1
4/21 00:40	66.6	↑1.0
4/21 00:50	67.5	↑0.9
4/21 01:00	68.3	↑0.8
4/21 01:10	68.9	↑0.6
4/21 01:20	69.4	↑0.5
4/21 01:30	69.8	↑0.4
4/21 01:40	70.0	↑0.2
4/21 01:50	70.1	↑0.1	満潮
4/21 02:00	70.0	↓-0.1
4/21 02:10	69.8	↓-0.2
4/21 02:20	69.4	↓-0.4
4/21 02:30	68.9	↓-0.5
4/21 02:40	68.3	↓-0.6
4/21 02:50	67.5	↓-0.8
4/21 03:00	66.6	↓-0.9
4/21 03:10	65.6	↓-1.0
4/21 03:20	64.4	↓-1.2
4/21 03:30	63.2	↓-1.2
4/21 03:40	61.9	↓-1.3
4/21 03:50	60.5	↓-1.4
4/21 04:00	59.0	↓-1.5
4/21 04:10	57.4	↓-1.6
4/21 04:20	55.8	↓-1.6
4/21 04:30	54.2	↓-1.6
4/21 04:40	52.5	↓-1.7
4/21 04:50	50.9	↓-1.6
4/21 05:00	49.2	↓-1.7
4/21 05:10	47.5	↓-1.7
4/21 05:20	45.9	↓-1.6
4/21 05:30	44.3	↓-1.6
4/21 05:40	42.8	↓-1.5
4/21 05:50	41.3	↓-1.5
4/21 06:00	39.9	↓-1.4
4/21 06:10	38.6	↓-1.3
4/21 06:20	37.4	↓-1.2
4/21 06:30	36.4	↓-1.0
4/21 06:40	35.4	↓-1.0
4/21 06:50	34.5	↓-0.9
4/21 07:00	33.8	↓-0.7
4/21 07:10	33.3	↓-0.5
4/21 07:20	32.9	↓-0.4
4/21 07:30	32.6	↓-0.3
4/21 07:40	32.5	↓-0.1	干潮
4/21 07:50	32.5	0
4/21 08:00	32.7	↑0.2
4/21 08:10	33.1	↑0.4
4/21 08:20	33.6	↑0.5
4/21 08:30	34.3	↑0.7
4/21 08:40	35.1	↑0.8
4/21 08:50	36.1	↑1.0
4/21 09:00	37.2	↑1.1
4/21 09:10	38.5	↑1.3
4/21 09:20	39.9	↑1.4
4/21 09:30	41.4	↑1.5
4/21 09:40	43.0	↑1.6
4/21 09:50	44.7	↑1.7
4/21 10:00	46.5	↑1.8
4/21 10:10	48.4	↑1.9
4/21 10:20	50.3	↑1.9
4/21 10:30	52.3	↑2.0
4/21 10:40	54.4	↑2.1	最大潮位差
4/21 10:50	56.4	↑2.0
4/21 11:00	58.5	↑2.1	最大潮位差
4/21 11:10	60.5	↑2.0
4/21 11:20	62.6	↑2.1	最大潮位差
4/21 11:30	64.6	↑2.0
4/21 11:40	66.6	↑2.0
4/21 11:50	68.5	↑1.9
4/21 12:00	70.3	↑1.8
4/21 12:10	72.1	↑1.8
4/21 12:20	73.7	↑1.6
4/21 12:30	75.3	↑1.6
4/21 12:40	76.7	↑1.4
4/21 12:50	78.0	↑1.3
4/21 13:00	79.2	↑1.2
4/21 13:10	80.2	↑1.0
4/21 13:20	81.1	↑0.9
4/21 13:30	81.8	↑0.7
4/21 13:40	82.3	↑0.5
4/21 13:50	82.7	↑0.4
4/21 14:00	82.9	↑0.2	満潮
4/21 14:10	83.0	↑0.1
4/21 14:20	82.8	↓-0.2
4/21 14:30	82.5	↓-0.3
4/21 14:40	82.1	↓-0.4
4/21 14:50	81.4	↓-0.7
4/21 15:00	80.6	↓-0.8
4/21 15:10	79.7	↓-0.9
4/21 15:20	78.6	↓-1.1
4/21 15:30	77.4	↓-1.2
4/21 15:40	76.0	↓-1.4
4/21 15:50	74.6	↓-1.4
4/21 16:00	73.0	↓-1.6
4/21 16:10	71.3	↓-1.7
4/21 16:20	69.5	↓-1.8
4/21 16:30	67.7	↓-1.8
4/21 16:40	65.8	↓-1.9
4/21 16:50	63.9	↓-1.9
4/21 17:00	61.9	↓-2.0
4/21 17:10	59.9	↓-2.0
4/21 17:20	57.9	↓-2.0
4/21 17:30	56.0	↓-1.9
4/21 17:40	54.0	↓-2.0
4/21 17:50	52.1	↓-1.9
4/21 18:00	50.3	↓-1.8
4/21 18:10	48.5	↓-1.8
4/21 18:20	46.8	↓-1.7
4/21 18:30	45.1	↓-1.7
4/21 18:40	43.6	↓-1.5
4/21 18:50	42.2	↓-1.4
4/21 19:00	41.0	↓-1.2
4/21 19:10	39.8	↓-1.2
4/21 19:20	38.9	↓-0.9
4/21 19:30	38.0	↓-0.9
4/21 19:40	37.3	↓-0.7
4/21 19:50	36.8	↓-0.5
4/21 20:00	36.4	↓-0.4
4/21 20:10	36.2	↓-0.2	干潮
4/21 20:20	36.2	0
4/21 20:30	36.3	↑0.1
4/21 20:40	36.6	↑0.3
4/21 20:50	37.1	↑0.5
4/21 21:00	37.7	↑0.6
4/21 21:10	38.5	↑0.8
4/21 21:20	39.4	↑0.9
4/21 21:30	40.5	↑1.1
4/21 21:40	41.7	↑1.2
4/21 21:50	43.0	↑1.3
4/21 22:00	44.5	↑1.5
4/21 22:10	46.0	↑1.5
4/21 22:20	47.6	↑1.6
4/21 22:30	49.3	↑1.7
4/21 22:40	51.1	↑1.8
4/21 22:50	52.9	↑1.8
4/21 23:00	54.7	↑1.8
4/21 23:10	56.6	↑1.9
4/21 23:20	58.5	↑1.9
4/21 23:30	60.3	↑1.8
4/21 23:40	62.2	↑1.9
4/21 23:50	64.0	↑1.8